US2646080A - Paper indicated dobby - Google Patents

Description

July 21, 1953 c. R. KRONOFF 2,646,030

v PAPER IN ICATED DOBBY Filed May 21, 1952 3 Sheets-Sheet 1 INVENTOR CLARENCE R .KRONOFF ATTO RNEY.

July 21, 1953 c. R. KRQNOFF ,646,

PAPER INDICATED DOBBY Filed May 21, 1952 5 Sheets-Sheet 2 FIG-2 INVENTOR CLARENCE R. KRONOFF "mmw ATTORNEY y 21, 1953 c. KRONOFF 2,646,080

PAPER INDICATED DOBBY Filed May 21, 1952 3 Sheets-Sheet 5 INVENTOR CLARENCE R. KRONOFF Arronuik. j

Patented July 21, 1953 UNI TED STATES -AT ENT OFFICE PAPER INDICATED DOBBY Clarence R. .Kronoff, Worcester, Mass, .assignor to \Cr0mpton.&Knowles Loom Works, Worcester, Mass acorporation of Massachusetts :ApplicationMay 21, 1952,.Serial Nofizsaovo .21 Claims. (cries-6s.)

blank :or non-perforated parts which support other of the elements. The pattern readersare utilized-in such instances to position hook lifting means constituting a separate set of parts "which arethen moved .bylan actuatorto determine the position of the hooks with respect to their knives. The force required .to lift a hook is ordinarily greater than that which a blank ;.part of the paper pattern oan withstand without being punctured by the reading elements and it is for this reason-that two separate sets of parts are introduced between the paper pattern andithe hooks.

It is an important object of the present inventiontoeliminate the aforesaid secondset of parts and utilize the pattern. reader elements 'not only to read the pattern but also to effect lifting of the hooks. This-.resultiis accomplished hymounting the pattern readers on a movable .carrieror the like which first moves the read- =ing elements toward the paper pattern to read it, after which :the reader elements are looked :to the carrier in the positions .which theyoccupy .asdetermined'hy the paper pattern, and are then lifted to elevate the books which should be raised.

In the usual-paper indicated dobby the pat: tern readers remain in reading position for a considerable period of .theoycle of .operationof .the dobby and while the readersare in reading positionthe paper-patterncannot be.moved. It

isa further object .of the present invention to effect ,pattern reading during acomparatively shortinterval'of thedobbycyclestore the reading, and then move the pattern reading elements away from the .pattern toward .the hooks. In this .Way the-pattern readers .have only vmomentary readingrelation with .respect to the .pat-

tern-and the pattern is free to be moved during the greater part of the cycle of 'the dohby to present a new surface'in reading position.

"NV-hen the invention is applied to a.so-called :douhle iind'ex dnbby -..one :pattern'reading opertheir weight only.

.ationis performed-for two picks of ..the' loom and when the pattern reading has been completed indications -:for .two' successive .picks of the -loom are stored due to locking of the patternreaders with respect to the aforesaid carrier. .It is a further object of the invention togive the carrier two hook controlling motions between successivereading operations, one of thesemotions being primarily for oneset of .hooks and the other motion being primarily for the other set of hooks. As will .be [set forth hereinafter-the carrier is raised. .to .a ,hook controlling position prior to the workingstroke .of .one .of .the knives.

is then lowered wan-intermediate non-controlling position to avoid exerting .a force .on hooks alreadyengaged with-theotherlknife, and is then returned to the :hook controlling position prior to the workingstroke of .the other knife. .The

.storedindicationsfor these twopicks of the cycle are retainedduring the two movements of the carrier due to the fact that the lockmechanism will be :in looking .position from a time shortly after completion .of reading of the pattern until after the secondset of hooks haveheen engaged.

.: by the other knife.

When theaforesaid carrier has a motion toward the paper patternthe pattern reading ele- -ments shouldbe unlocked so that theforce which they exert on the paper pattern will be due to .In order to-accomplish this result it is another object of the invention to cause a slight pause or dwell in the motion of the 'carrier toward the pattern to arrest any downward momentum which the elements might haveacquired dueto descent of the carrier. The

lock mechanism-canalso move to unlockingposition during this slight pause or dwell.

It is-a furtherzobjectof the invention toprowide ,a dobby unit comprising a set of pattern reading and hook lifting. elements .movahle on acarrier and a .still .further. object is .to provide the unit with lock mechanism for the elements to forman assembly usable von.a..dohloy.

In order that the invention imay be clearly understood referenceiis madeto the accompanying drawings which illustrate .by way of example the embodiments of the invention and in which:

2, showing the locking mechaniSm,

55 "Fig.4 is .a vertical section on line 4- L4,1Fig.

2, showing the mechanism by which the carrier for the pattern readers is moved,

Fig. 5 is an enlarged vertical transverse section on line 5-5, Fig. 2,

Fig. 6 is a detail enlarged vertical section on line 6--6, Fig. 2,

Fig. '7 is an enlarged vertical section on line E -i, Fig. 2, showing the mechanism for disabling the locking means shown for instance in Fig. 3 to enable the dobby to be leveled,

Fig. 8 is a diagrammatic view similar to a part of Fig. 3 showing the pattern reading elements performing a reading operation,

Fig. 9 is a View similar to Fig. '8, but showing the lock mechanism in position to store the indications derived from the paper pattern,

Fig. 10 is a view similar to Fig. 9 but with the dobby hooks added and indicating a hook locating operation derived from motion of the aforesaid carrier toward the hooks, and

Fig. 11 is an enlarged detail horizontal section on line H-! I, Fig. 10, showing the relation between one of the lock bars and one of the pattern reading elements. 7

Referring more particularly to Figs. 1 and 2, the loom frame indicated at I supports a double index dobby designated generally at D and including front and back side or frame plates 2 and 3, respectively. These plates guide top and bottom harness lifting knives 4 and 5, respectively, which are actuated through connectors 5 by a three armed lever i oscillated by a loom driven upright rod 3 having a complete reciprocation in a twopick cycle of the loom. Harness lifting jacks 9 are pivotally mounted on a pin [0 extending between and secured to the plates 2 and 3, and each jack as a dobby back lever ll having pivoted to the ends thereof upper and lower dobby hooks i2 and I3, respectively. These hooks are for cooperation with the knives 4 and 5, respectively, and when the upper and lower hooks of any lever H are disengaged from their knives the jack will be to the left, Fig. 1, so that the corresponding warp lifting harness (not shown) will be down. If one or another of the hooks of a lever H is engaged with its knife the lever will then move to the right to effect lifting of the corresponding harness frame through the associated jack S9.

A shaft i5 is journaled for rotation with respect to the dobby in right and left bearings l6 and IT, respectively, Fig. 2, and is driven by a loom operated chain H! which effects rotation of shaft 15 once in two picks of the loom. Shafts l5 has secured thereto a worm 19 which meshes with a worm wheel. Zil secured to a shaft 2! journaled for rotation on the dobby and having secured thereto a paper pattern cylinder 22. The worm is eifects step by step advance movements of the cylinder 22 every second. pick of the loom. Trained over the cylinder is a paper pattern P below the hooks l2 and [3 having indications arranged in transverse rows, these indications being either perforations 25 or blank or unperf0- rated parts 26. These rows of perforated and non-perforated parts are arranged in parallel pairs, one row of the pair for the set of upper hooks l2 and the other row for the set of lower hooks l3. When the paper pattern is temporarily at rest one pair of these rows will be in reading position. It is customary in dobby construction to employ a yieldable clutch between worm wheel 20 and shaft 2! to permit manual turning of cylinder 22 when shaft I5 is at rest, but this clutch is omitted from the drawings for the sake of clarity.

Except as noted hereinafter the matter thus far described is of usual construction, the knives 4 and 5 being reciprocated in opposite directions by the rocker lever l and the paper pattern being moved progressively by astep and step motion to present new pairs of rows of perforated and non-perforated indicating parts thereof to reading position. It will be understood that the bottom knife 5 is'shown in Fig. 1 as being in the position which it occupies at the beginning of a working stroke thereof to the right, and that knife 4 is shown as having completed a working stroke and is in position to start an idle return stroke. On the next beat of the loom knife '5 will have a'return stroke and knife i will have a working stroke. In the present instance the hooks l2 and i3 are normally down in the paths of their respective knives but can be lifted to be out of the paths of their knives.

In carrying the invention into effect a horizontally extending unit U including a carrier C of elongated form is mounted for vertical reciprocation between the cylinder 22 and bottom hooks 53. This carrier is guided in its vertical motion by upright guides secured to supports 3| fastened to the dobby plates 2 and 3. The carrier is held against endwise motion by stops 32, see Fig. 5, secured thereto at 33 and engaging the associated guides 39. One of the bearings M for the pattern cylinder shaft 2! is indicated in Fig. 5 and a collar 35 secured to the shaft 2i aligns the cylinder horizontally with the carrier C.

As indicated more particularly in Fig. 3 the carrier has mounted for vertical sliding motion therein two parallel rows of pattern reader and hook lifter elements 3% and 31. Each of these elements comprises a slender downwardly extended stem or wire 38 and an upper cylindrical head 39 and a collet 40 below the head 39. The parts 38, 39 and ii are preferably integral and can move vertically on the carrier, the stems being slidable in holes in the lower part of the carrier and the heads and collars being slidable in larger holes 62 opening upwardly in the upper part of the carrier. The head and collet of each element are connected by a continuation of the stem. The stems extend below the carrier and the heads preferably above it.

The carrier is provided. with lock mechanism by which the reading and lifting elements 36 or 37 can be locked either in high or low position against downward movement with respect to the carrier. As shown more particularly in Fig. 3 this lock mechanism comprises a pair of lock bars 55 and 46 located respectively at the right and left sides of the carrier C as viewed in Fig. 3. These lock bars are mounted at their ends on levers 4'! and 68, respectively, which are pivoted at 49 at their lower ends to downward extensions 50 at the-ends of the carrier. There are two each of the levers 4i and 48, and the upper ends of each pair of levers ll and 48 are connected by a tension spring 5i which tends to draw the bars 45 and 65 toward each other to the position shown in Fig. 3.

The lock bars 45 and M5 are movable in a substantially horizontal direction in slots 52 and 53 extending horizontally and lengthwise on opposite sides of the carrier C. These slots communicate with the upper larger bores 52 in the carrier. The edges of the lock bars may be formed as shown in Fig. 11 with notches 55 to fit around the slender stems 3. so that the parts 56 of the bar adjacent to each notch can extendxunder a relatively large part ofeither ahead 39 or a collet 46 of the associated elements 36 or 31.

Each lever 48 has a finger 60 which projects under a similar finger 6-] on the adjacent lever 4i and whenever alever Ml is-moved t'o-theleft from the position shown in Fig. 3 its finger 60 will raise finger 6 of the adjacent lever 41 and cause simultaneous rocking of the latter to the right. Thetwo bars 45 and 46 and their associatedlevers and the spring may be considered as lock mechanism movably mounted on the carrier C so that it can occupy either looking or non-locking position with respect to the pattern reader and lifter elements 36 and 31. The unit U and the lock mechanism may be considered as an assembly designated generally at A.

As-shown herein the lock bar 46 is pivotally con- 7 nected as at 65 to two laterally extending rods 66- each having a pivotal connection 61 with a depending'arm '68 secured in angularly adjustedposition on a rock shaft 69 by a set-screw Hi. The lower end of one of the arms 68 cooperates with a cam- H secured to a rotating shaft I2 one end of which has secured thereto a mitre gear 13 meshing with a second mitre gear 74- secured to previously described shaft [5. The gears 73 and M are of the'same size so that shaft 72 completes a rotation in two picks or beats of the loom. Shaft 12 is journaled for rotation in bearings secured to the dobby frame. Cam H has a relatively long low dwell (-6, a shorter high dwell El and inclines l'll joining the dwells. If desired each connec tion 6'! may include a pin 19 on arm 68 fitting into a slot 8!! formed in the adjacent end of rod 65.. 3-.

During operation of the dobby the cam M will effect momentary rocking of the arms 63 to the left as viewed in Fig. 3' to cause the lock bars 45 and 4'8 to move from the locking position shown in Fig. 3' to a non-locking position, after which continued rotation of cam H will enable the lock bars under action of springs 51 to return to looking position and remain in that position so long as the low dwell 16 controls the position of the lock mechanism.

The carrier C has already'been described as being mounted for vertical rising and falling motion and this motion is caused by operating means shown in detail in Fig. 4. Shaft 12 has a cam 85 secured thereto for cooperation with an actuator lever 86 secured at 81' to one end of a transverse shaft 88 rockable in bearings 89 fixed with re spect to the dobby. The other end of shaft 88 has an arm 96 secured thereto at BI and as the cam rotates a roll 92 on lever 86 located in a cam groove 93 will cause the right end of lever 86, Fig. 4, and the end of arm 90 to rise and fall in a time relation which will be described. The carrier C has the ends thereof provided with gudgeons 94 which pass through slots 95 in the lever 83 and arm 90. The. carrier is therefore raised and lowered by action of the cam 85 when the dobby is in operation. The cam has a low dwell 96, a higher dwell 91, and actuating areas orpoints 98. and 99 connecting the dwells and 10-- c'ated on opposite sides of the dwells. The areas or points "98 and 99 extend farther fromthe axis ofthe cam than the dwell 91. p

In operation, it may be assumed that roll 92 is in the low dwell 96, so that lever 86 has been turned to its extreme clockwise position as viewed in Fig. 4 to lower the carrier C to its lowest position. The elements 36 and 37 will therefore be able to read thepattern of the two rows of indication parts of the paper pattern under them and'some of these elements will pass througlrperforations and will be in low position with respect to the carrier while others will engage unperforated parts of the pattern and will be. in high position with respect to thecarrier. At this time the high dwell H of cam H will hold the lock ter-clockwise direction, Fig. 3, to enable the springs 5! to move the lock bars 45 and 4.6 to the locking position shown diagrammaticallyin Fig. 9 while the carrier is still in low position. As soon as the lock bars have moved to locking posi tion the indications given by the pattern reader and hook lifter elements will be stored with respect to the carrier. As shown. in Fig. 9 the right hand element will have its head 39 resting on the lock bar 45 whereas the left hand element 3'! will have its collect 40 resting on the lock bar 45. 'Ihis'locking and. indication storing relation will continue so long as the low dwell 16 of cam ll controls the lock mechanism.

As cam turns in thedirection of arrow a, Fig. 4, it will rock lever 85 in a counter-clockwise direction, Fig. 4, and in. doing so will raise the carrier and elements 36 and 3! away from the pattern and complete their upward. motion. to hook controlling position shortly before bottom knife 5 begins anoutward working stroke. During upward motion of the'carrier the elements 35 and 31 in high position will be supported by lock bars, and as shown herein the elements in low position will also be supported by the lock bars, although "the low elements need not be thus supported. During this first upward motion of the carrier any element 36 or 31 which is locked in low position will permit the hook registered with it to remain in the path of its knife,

and conversely any element which is locked in high position with respect'to the carrier will raise its hook out of'the' path of its knife. This is illustrated' inFig. 10', wherein an upper hook I2. is shown as associated with a hook lifterwire H85 in re'gister'with an element 3'6 in low position, while a lower hook i3 is positioned by a hook lifter wire I06 registering with an'element 3! in high position. These wires l05'and EBB may be simi lar to wires customarily used in dobbies and their upper ends may be hooked over support guides I ll! and their lower ends may pass through a guide H18, see Fig. 1.

As soon as areaor point 98 of cam 85 has raised the carrier to its extreme high position the knife 5 will start a right hand working stroke as viewed in Fig.1 and any hook which has been permitted toremain in the path of the knife due to the fact that the associated element 3! is in low position will be engaged by the knife and be moved thereby to the right, but any hook [3 which has been raised out of the path of the knife 5 due to the fact that its associated element 3! is in high position with respect to the carrier will remain idle. In Fig. 10 the hook l3 shown in full lines isassumed to have been controlled by an element 3T in. high position relative to the carbeen permitted to remain in its normal low position.

At this time in the operation of the dobby it is likely that one or more of the top hooks 52 will be engaged with the knife 4 which has just completed its working stroke and is about to return on an idle stroke. When the carrier rises to its high position it lifts the wires I05 as well as wires I06. Such hooks l2 as were not engaged with knife 4 will be free to move upwardly under action of the corresponding wires m5 and elements 36 without effecting operation of the dobby, but any hook l2 engaged with the knife 4 at this time will resist upward movement if its lifter wire Hi5 were raised into engagement with it. In order to prevent this engagement the hooks [2 are arched upwardly as at I09, and 'a wire I05 can therefore be raised to the high position shown in Fig. 1 without engaging its corresponding hook l2 if the latter is held by the knife 4.

As the top knife starts its return motion to the left as viewed in Fig. 1 the cam 85 will turn sufficiently to effect clockwise turning of lever 86, see Fig. 4, to lower the carrier to an intermediate position and therefore permit downward motion of any lifter wire 105 corresponding to a hook engaged with knife 4. Descent of the carrier continues until roll 92 enters high dwell 9'! at which time the wires Hi5 are low enough to permit their hooks to move to the left, Fig. 1, as the knife 4 completes its return motion. The carrier will be held in its intermediate position until knife 4 releases any hooks previously engaging it.

Preparatory to the working stroke of knife which occurs on the next beat or pick of the loom the cam 85 will have turned sufficiently to return the carrier C to its high hook controlling position due to location of roll 92 in the high area or point i 99 in the cam groove 93. As soon as top knife l has engaged the hooks [2 which have been permitted to remain in its path there is no longer need for the carrier to remain up, and cam 85 therefore by continued motion effects another clockwise turning of lever 86, Fig. 4, to lower the carrier.

In the down motion of the carrier however it is necessary to effect unlocking of elements 36 and 31 from the carrier before they engage the paper pattern. As shown herein unlocking occurs while carrier C is temporarily at rest. Cam groove 93 has a slight dwell H0 which produces a momentary pause or dwell in the down motion of the carrier. During this dwell the cam 11 by operation of the other of its inclines it rocks lever 68 to the left, Fig. 3, and thus moves the lock mechanism to unlocking position as shown in Fig. 8. The short dwell HG mometarily stops down motion of the elements 36 and 31 to arrest their momentum. Thereafter continued turning of cam 85 will move the roll 92 back into the low dwell 96 and the carrier will again move to low pattern to permit the unlocked elements 36 and 31 to perform another pattern reading operation. Because of the fact that the momentum of the elements has been arrested, the only force they exert on the paper during the reading operation is that due to their weight. While the unlocking has been described as occurringduring the pause caused by dwell Hi),

the invention is not necessarily limited to unlocking at this time.

Before the second reading of the pattern it will have been necessary for the pattern to move one step to present another pair of rows of perforated and unperforated indicating parts thereof to reading position, and this motion of the pattern will have been effected at any time during the period in the operation of the dobby between the time the carrier moves the elements 36 and 31 away from the paper pattern and the time when the carrier is again in low enough position to effect the next reading of the pattern. It will be understood from the preceding description that this period in the cycle is relatively long so that the worm l9 will have ample time to give the cylinder 22 a gradual turning motion. This period of time can be longer than that existing in the usual paper indicated dobby due to the fact that as soon as the pattern has been read the elements 35 and 3'5 are moved away from the paper and the latter is therefore free to turn. In the usual paper indicated dobby the readers remain in reading position until after the top knife has picked up the hooks which have been indicated for engagement by it.

It may be desirable to level the dobby to enable the harnesses to come to a common position, in which event some provision must be made for relinquishing the control of the hooks which would otherwise be exercised by the elements 36 and 37. To effect leveling the shaft 69 has a collar H5 secured thereto by a set screw H6 and the collar has projecting therefrom a stop pin I IT. A lock pawl 1 I8 is pivoted on a pin 4 i9 secured to the dobby, see Figs. 2 and 7. Ordinarily the rocking of shaft 59 under action of cam H will move the collar and the pin 41 from the full line position shown in Fig. '7 to the dotted line position, permitting the lock pawl I [8 to remain down on a stationary stop pin I20. The locking mechanism is therefore able to operate as already described hereinbefore. When however it is desired to level the dobby a hand wheel 12! secured to shaft 69 is turned in a clockwise direction as viewed in Fig. '7 until the pin H! has moved to a position to the right of the pawl I I8. During this operation the pawl will first be raised by the pin and then will fall behind the pin as shown in dot and dash lines at b, Fig. '7. Shaft 69 is thereby locked with the arms 68 moved to the left as viewed in Fig. 3 to hold the locking bars 45 and 4G in unlocking position. The dobby can therefore operate but the springs 5! will be unable to move the lock bars to locking position and although down motion of the carrier C will result in a reading of the pattern, as soon as the carrier is moved upwardly the elements 36 and 3?, not being locked, are free to slide down on the carrier to their low positions and all of the hooks will therefore remain down to effect leveling.

From the foregoing it will be seen that the invention sets forth a simple paper pattern indicated dobby wherein a set of elements, such as 38 and 3?, first move toward the pattern to read it and then move away from the pattern to a hook controlling position to determine the position of the hooks with respect to the lifter knives. Lock mechanism, such as lock bars 45 and 56, stores the reading of the pattern to enable the reading to be used after the elements have been removed from the pattern. During the reading operation the forces exerted on the paper are small and due to the weight only of the elements, but after locking the elements are able to exert a much larger force suflicient to lift the hooks. Certain features of the invention are not limited to double index dobbies, but when the invention 9 is applied: to dobbiesi of that type indications; for two successive picks arev stored in the mechanism by a single reading of thepattern. The carrier is 'controlled-insuch manner as to lower the elements to an intermediate position-during the return stroke of the knife which utilizes theindication for the second pick, thereby avoiding exmentum of the elements and alsoaiiords'time:

for unlocking them before they are. again pre'- sented to the pattern; The invention also sets forth a novel'unit comprising the carrier-and elements 36 and 31, and further shows an assembly" wherein the lock mechanism is combined with the unit. The arrangement of'the pattern, ele: ments 36 and 31, and the hooks=is such that a perforation in the pattern corresponds to an'indication for the associated hook to be in thepath of its knife. Furthermore, the, dobby can be leveled by manually movingthe lock bars to nonlockin'g position relative to the elements.

Having now particularly described and ascertained the nature of the invention and in what manner the same is to be performed, what is claimed is:

1. In a loom dobby having a set of harness lifter hooks normally in the'path of 'a reciproeating lifter knife, a paper pattern'belowthe hooks having perforated and unperforated indicating parts, combined pattern reading and hook lifting elements which first have a movement toward the pattern to perform a pattern reading operation and then have a second movement away from the pattern toward the hooks, the elements registering with unperforated parts of the pattern being above the elements registering with perforated parts of thepattern upon completion of the pattern reading operation, and mechanism to lock the elements with respect to each other on completion of the first movement there of, the elements which are above the other elements being effective to move the hooks in register therewith out of the'path of the knife when said elements have said second movement thereof.

2. In a loom dobby having a set of harness lifterhooks normally in the path of a reciprocating lifter knife, a paper pattern below the hooks having perforated and unperforated indicating parts, an indicating part of the pattern being ing elements movable vertically on the carrier,

one element being provided for each hook and each indicating part of the pattern, the carrier when' having said pattern reading movement causing, the elements to perform a pattern reading operation upon completion of which certain elements will be in high position and other elements willbe in low position relative to thecarrier, and mechanism operative upon completion of the reading operation to lock the elements against downward motion relative to the carrier in their relative positions with respect to the carrier', the carrier when-having said hook lifting,

The slight. dwell in the- 7 upon completion of the pattern reading operation tolock the elements-against downward mo-- movement causing. the elements locked in high position on the carrier to effect movement of. the

corresponding hooks out of the path of the knife.

The loom dobby set forth in-claim 2 whereadditional manually operated means is providedtoprevent themechanism from locking the elements relativeto the carrier to-enable all of said-elementsto'be in low position-relative to the carrier as the. latter has said hook'lifting movement torprevent' lifting of any of the hookswhen it; is desired: to I level the dobby.

45in a loom dobbyhaving a set of harness lifter hooks normally'in the path of a reciprocat- 'ing; lifter knife,- a paper patternbelow the hooks having: perforated and unperforated indicating par-ts,-. anindicating part of the pattern being" provl-rledifor each hook, a unit-intermediate the set of:, hooks and the-paper pattern moving first toward the patternand thentoward the hooks, said unitcomprising a carrier and combined pattern reading and hook lifting elements slidable, vertically; ontheca-rrier, the-carrier when moving toward-thepattern causing-the elements to perform a pattern reading operation'upon completion of' which the elements registering with the perforated indicating partsof the pattern will be in low. position relative to the-carrier and the elements engaging unp'erforatedindicatingv parts of the pattern willbe in high position relative to the carrier, and-mechanism operative tion'relativeto'the carrier in-their high and low positions: on the carrierv and co-operating with the carrier when the unit moves toward the hooks to. cause the elements. in. high positionon the carrier to efiect" movement of the hooks corresponding thereto out of the path of theknife, thei'hooks corresponding to the elements inlow position remaining-in'the path or the knife.

5; ma loom dobby having a set of harness lifter hooksnormally inthepath'of a reciprocat+ ing lifter; knife, a paper pattern below the hooks having. perforated and unp'erforated indicating parts, a setiof combinedpattern reading and hook lifting elements each registering with a hook and. an indicating part of the pattern, means moving theelementstoward the pattern to perform a pattern reading operation upon completion of whichthe elements: registering with the perforated indicating parts of thepattern willibe in low position relativeto the means and the elements registering with the unperforated indicating parts" of'the pattern will be in high position relative tothe means, mechanism oper ative upon completion of the pattern reading operationto: lock the elements in their high and low positions on the meansagainst downward motion relative-to said means, and said means thereafteri'movingthe elements'while they are locked relativeitothe means toward the hooks ing' harnesslifterknife having working and re-' turnstrokes; a paper pattern below the hooks having perforated and unperforated indicating parts, an indicating part of the pat tern being providedfor'eaoh hook, a unit intermediate thev hooks: and 1 paper pattern comprising a vertically movable carrier having combinedpattern readingand'hook lifting elements mounted thereon for vertical movement relative thereto,- operat- 11 ing means for the carrier effective to lower the latter to cause the elements-I to perform a pattern reading operation upon completion of which certain of the elements will be in high position and other of the elements will be in low position relative to the carrier, mechanism thereupon locking the elements against downward motion relative to the carrier, said operating means thereafter raising said carrier to hook controlling position to cause the elements in high position relative to the carrier to effect movement of the hooks corresponding thereto out of the path of said knife prior to the beginning of the working stroke thereof and thereafter causing downward motion of said carrier subsequent to said beginning of the working stroke for a second pattern reading operation, and said mechanism acting to unlock said elements relative to the carrier subsequent to said beginning of said working stroke and prior to said second pattern reading operation.

7. A loom dobby as set forth in claim 6 wherein the operating means causes a slight dwell in said downward motion of the carrier to arrest momentum of said elements prior to said second pattern reading operation.

8. A loom dobby set forth in claim '7 wherein said mechanism unlocks said elements during said dwell in the downward motion of the carrier.

9. In a double index dobby operating on a two-pick cycle having two knives one of which has a working stroke on the first pick of the cycle followed by a return stroke on the second pick of the cycle and the second knife of which has 'a return stroke on the first pick of the cycle and a working stroke on the second pick of the cycle, a set of harness lifter hooks normally in the path of the first knife and a second set of harness lifter hooks normally in the path of the second knife, a paper pattern below said hooks having two rows of perforated and non-perforated indicating parts, one row for the first set of hooks and the other row for the other set of hooks, a unit intermediate said hooks and pattern comprising a carrier and two rows of combined pattern reading and hook lifting elements movable vertically on the carrier, one row of elements for each row of indicating parts of the pattern and one element in each row of elements for each hook in the corresponding set of hooks, carrier operating means moving the carrier and elements toward the pattern to cause the elements to perform a pattern reading operation upon completion of which certain of the elements will be in high position and other elements will be in low position relative to the carrier, mechanism thereupon effective to lock the elements against downward motion relative to the carrier, and said carrier operating means thereafter effective to raise said carrier and elements to hook controlling position to cause the elements in high position relative to the carrier to effect movement of the hooks corresponding thereto out of the paths of their respective knives prior to the working stroke of the first knife and effective subsequent to the start of the workingstroke of the second knife to lower said carrier and elements for another pattern reading operation.

10. A double index loom dobby set forth in claim 9 wherein said carrier operating means lowers the carrier and elements to an intermediate position in which the elements are out of control of the hooks subsequent to the beginning of the working stroke of the first knife and returns the carrier and elements to hook controlling position prior to the beginning of the working stroke of the second knife.

11. The double index loom dobby set forth in claim 10 wherein the operating means effects descent of the unit toward the pattern subsequent to said return of the carrier and elements to hook controlling position and the mechanism holds the elements locked relative to the carrier until after said return of the carrier and elements to hook controlling position and unlocks the elements during said descent of the carrier toward the pattern.

' 12. In a double index loom dobby operating on a two-pick cycle having two knives one of which has a working stroke on the first pick of the cycle followed by a return stroke on the second pick of the cycle and the second knife of which has a return stroke on the first pick of the cycle and a, working stroke on the second pick of the cycle, aset of harness lifter hooks normally in the path of the first knife and a second set of hooks normally in the path of the second knife, a paper pattern below said hooks having two rows of perforated and non-perforated indicating parts, one row for each set of hooks, a unit intermediate the hooks and pattern comprising a carrier and combined pattern reading and hook lifting elements movable vertically on the carrier, and operating means for the unit effective during a two pick cycle to cause the unit to havea movement to a low pattern reading position, then have afirst movement to a high hook controlling position, thereafter have a movement to an intermediate position in which the elements are out of controlof the hooks, and then have a second movement back to high hook controlling position, the elements when the carrier is in said low position performing a pattern reading operation upon completion of which certain of the elements will be in high position and other elements will be in low position relative to the carrier, mechanism operative upon completion of the pattern reading operation prior to the beginning of said first movement of the carrier to high position to lock the elements against downward motion relative to the carrier, said operating means effective to complete said first movement of the carrier and elements to high hook controlling position prior to the working stroke of the first knife to cause the elements in the row corresponding to the first set of hooks and in high position relative to the carrier to effect movement of the corresponding hooks in said first set of hooks out of the path of the first knife, and the operating means being effective to complete the second movement of the carrier to high position prior to the working stroke of the second knife to cause the elements of the other row in high position relative to the carrier to effect movement of the corresponding hooks of the second set of hooks out of the path of said second knife.

' 13. In a double index loom. dobby operating on a, two-pick cycle having two knives one of which has a working stroke on the first pick of the cycle followed by a return stroke on the second pick of the cycle and the second knife of which has a return stroke on the first pick of the cycle and a working stroke on the second pick of the cycle, a set of harness lifter hooks normally in the path of the first knife and a second set of harness lifter hooks normally in the path of the second knife, a paper pattern below said hooks having perforated and nonperforated indicating parts,

13 a unit intermediate the hooks and the pattern comprising a carrier and combined pattern reading and hook lifting elements slidable vertically on the carrier, operating means moving the carrier and elements to a low position to cause the elements to perform a pattern reading operation for the two successive picks of the cycle, certain of the elements being in high position and others being in low position relative tothe carrier upon completion of the pattern reading operation, mechanism thereupon effective to store the reading for said two picks by locking the elements against downward motion relative to the carrier, said operating means thereafter moving the unit away from the pattern to a high hook controlling position to cause the elements in high position relative to the carrier to effect upward movement i 'of the hooks corresponding thereto out; of the paths of their respective knives prior to the beginning of the working stroke of the first knife and the operating means thereupon effecting movement of the unit to an intermediate position in which the elements are out of controlling position relative to the hooks while the second knife has said return stroke thereof and the operating means then returning the unit to high hook controlling position prior to the working stroke of the second knife.

14. In a double index loom dobbyoperating on a two-pick cycle having two knives one of which has a working stroke on the first pick of the cycle followed by a return stroke on the second pick of the cycle and the second knife of which has a return stroke on the first pick of the cycle and a working stroke on the second pick of the cycle, a set of harness lifter hooks normally in the path of the first knife and a second set of harness lifterhooks normally in the path of the second knife, a paper pattern below said hooks having two rows of perforated and non-perforated indicating parts, one row for the first set of hooks and the second row for the second set of hooks,

a unit intermediate the hooks and pattern comprising avertically movable carrier and combined pattern reading and hook lifting elements movable vertically relatively to the carrier, a cam which rotates once during each two-pick cycle having alow dwell and a high dwell and two actuating areas, one area on one side of said dwells and the second area on the opposite side of said dwells, mechanism to lockthe elements against downward motion relative to the carrier, and operative connections between the cam and the unit causing the carrier to place the elements to perform a pattern reading operation when the low dwell of the cam controls the operative connections, said mechanism locking the elements relative to the carrier upon completion of the pattern reading operation so that some of said elements are in high position and others are in low position'relative to the carrier, said operating connections and cam thereafter effective to lift the carrier and elements to a high hook controlling position when one of said actuating areas of the cam controls the operative connections to cause the elements in high position on the carrier to effect lifting of the hook corresponding thereto out of the paths of their respective knives after cooperating with said operating connections to return the carrier and elements to high hook controlling position to cause the elements in high position on the carrier again to effect lifting of the hooks corresponding thereto out of the paths of their knives prior to the beginning of the working stroke of the second knife.

15. A double index loom dobby set forth in claim 14 wherein said locking mechanism is effective to maintain the elements locked with respect to the carrier from the time in the operation of the dobby when the low dwell controls the position of the carrier until after the second actuating area of the cam has returned the carrier tohigh hook controlling position.

16. An assembly for loom dobby provided with a paper pattern and harness lifter hooks comprising an elongated carrier and combined pattern reading and hook lifting elements slidably mounted on the carrier and capable of assuming either high or low positions'relative to the carrier when the latter is in the position it assumes when in use, and lock mechanism on the carrier to lock the elements against downward motion relative to the carrier when said elements are in either high or low position on the carrier.

17. An assembly as set forth in claim 16 wherein said elements are arranged in a row on the carrier and the lock mechanism comprises a lock bar extending lengthwise of the carrier and movable on the latter to one position to engage the elements and movable to another position out of engagement with the elements.

13. An assembly as set forth in claim 16 wherein the lock mechanism comprises two lock bars extending lengthwise of and mounted on the carrier for movement relative thereto, one lock bar on each side of the carrier, and wherein the elements are arranged in two parallel rows on the carrier between said bars, one row for each lock bar, and wherein resilient means normally draws said lock bars toward each other into engagement with the elements of their respective rows but yields to permit movement of said bars away from said elements to unlock the latter with respect to the carrier.

prior to the beginning of the working stroke of thefirst knife, said operating connections and high dwell of the cam causing the carriergto be locatedout of control position relative to said hooks'during part at least of the return stroke of the second knife, and said second area there- 19. An assembly set forth in claim 16 wherein each element is elongated and has a headat the upper end thereof and a collet thereon below the head and the lock mechanism includes a lock bar to engage the under side ofthe head of an element in low position on the carrier and engage the under side of the collet of an element in high position on the carrier.

20. An essembly as set forth in claim 16 wherein the elements are arranged in two parallel rows on the carrier and the lock mechanism includes two parallel lock bars, one look bar for each row of elements, mounted on the carrier for pivotal movement relative to the carrier into and out of engaging position with respect to elements oftheir respective rows.

21. An assembly as set forth in claim 20 wherein said lock bars are mounted on levers pivoted on the carrier and the levers have interengaging parts effective upon movement of one of said bars away from the row of elements corresponding thereto to cause movement of the other bar away from the row of elements corresponding to the other bar.

CLARENCE R. KRONOFF.

No references cited.

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